Vibrationally inelastic integral cross sections for the scattering of He from H2. II. Transitions to the ν=2 level

Integral cross sections for the scattering of He from H2 on the Gordon–Secrest potential are reported. Cross sections for excitations to the second excited vibrational level ν=2 were calculated at 11 energies in the range of 2.5–3.0 hωe. Both types of transitions (0, j) →(2,j′) and (1,j)→(2,j′) are shown to have the characteristic structures previously reported for (0,j)→(1,j′). Its detail appears to depend on both Δν and the final vibrational quantum number. Analyses of the cross sections σ2j′←νj and σ1j′←0j where ν?1;j,j′? 4 bring out several interesting observations in the dynamics of collisional excitation.